A woman from the turn of the 20th century…

A woman from the turn of the 20th century would sell people the time by letting them look at her watch. Ruth Belville, sold people the time. This was done by setting a Belville’s watch to Greenwich Mean Time, as shown by the Greenwich clock, each day and then “selling” people the time by letting them look at the watch and adjust theirs.

In October 1971, a physicist…

In October 1971, a physicist and an astronomer took 4 cesium-beam atomic clocks aboard commercial airliners. They flew twice around the world and when reunited, the sets of clocks were found to disagree according to the predictions of the relativity theory. So, Einstein accurately predicted that time moves more slowly the faster you travel.

Time seems to speed up as we get older

Time seems to speed up as we get older because each year we live is a smaller percentage of the total amount of time we’ve been alive. It’s called proportional theory.

There’s a suggestion that our perception of time may be in proportion to the length of our lifespan. Known as the “proportional theory”, this idea posits that as we age, our sense of “present” time begins to feel relatively short in comparison to our entire lifespan.